Website admin hacked

Hi guys got a problem: my network admin and primary website admin are redirected to a external website: http://www.com.nl.

Am in a bit of a state and wonder if someone can help me out here!

Already checked .htaccess, wp-config etc.etc. could find nothing. Called hosting company but they will have to call me back on account that they are closed for customers.

http://www.jaaadesignwebsitehosting.nl (primary)

Help!

Nick